What are routes 255.255.255.255/32 for in the routing table?

Question

Computer networks

255.255.255.255  255.255.255.255         On-link         127.0.0.1    331
  255.255.255.255  255.255.255.255         On-link      172.28.128.1    281
  255.255.255.255  255.255.255.255         On-link      192.168.53.1    281
  255.255.255.255  255.255.255.255         On-link     192.168.110.2    291

why are they?

Answer 1

These are Connected routes or routes to directly connected networks.
Packets cannot be sent without a route. If the route representing the target network is not in the routing table, then the packet will be dropped.
PS
By the way, if there is no connected route, but there is a default route, then traffic within one L2 space will pass through the router, and not directly from host to host.

Answer 2

255.255.255.255 - network broadcast 0.0.0.0/0. Those. global broadcast.
That is why it is present for every local address. When a request arrives in the IP stack to send a packet to the global broadcast address from any application, it will be sent through each available logical interface (local IP address). Similarly, it will be accepted from any interface and processed by the system.